Anyone have a Ducati 999 biposto?

[Artistimo]

I've got a 999S and earlier this summer I purchased a biposto subframe, tail plastics, seat, etc. All from the same seller on eBay. I just wanted it so I could take my gf for rides. This was not cheap and today I finally got around to putting it together. But there are lots of screws missing which I should be able to replace but there seems to be something missing for the passenger seat to clasp into place. Is there some kind of retaining part that I don't have or something? If anyone has a 999 biposto and is willing to snap a pic of what it looks like under the seat I'd greatly appreciate it! The seller of the items said he sent me everything but it doesn't look like it.